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Role of CSS :root Selector
Use the CSS : root selector to style document’s root element.
Example
You can try to run the following code to implement the :root Selector
<!DOCTYPE html>
<html>
<head>
<style>
:root {
background: blue;
color: white;
}
</style>
</head>
<body>
<h1>Heading</h1>
<p>This is demo text.</p>
</body>
</html>
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